Wear a suit in meetings with some IBM, Pfizer, Novozymes, Lord, etc....big guys. Usually the people we deal with are in jeans. I wear a hat and jeans to work almost early, can wear shorts if I want. It is all fading away what business dress is because what you look like shouldn't matter, what you can do should.
Also, I was meeting a client at my office and forgot and had jeans and a hat on. I looked him up on LinkedIn and he was from Penn's Wharton's school of business. I was like damn. Tucked in my shirt, took of my hat. He came in untucked with a hat, LOL. He was in his 40's.